arraydeque | A circular buffer with fixed capacity | Runtime Evironment library

by andylokandy Rust Version: 0.1.2 License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | arraydeque Summary

arraydeque is a Rust library typically used in Server, Runtime Evironment applications. arraydeque has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

A circular buffer with fixed capacity. Requires Rust 1.20+. This crate is inspired by bluss/arrayvec.

Support

Quality

Security

License

Reuse

Support

arraydeque has a low active ecosystem.

It has 91 star(s) with 17 fork(s). There are 3 watchers for this library.

It had no major release in the last 12 months.

There are 2 open issues and 8 have been closed. On average issues are closed in 171 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of arraydeque is 0.1.2

Quality

arraydeque has no bugs reported.

Security

arraydeque has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

arraydeque is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

arraydeque releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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arraydeque Key Features

No Key Features are available at this moment for arraydeque.

arraydeque Examples and Code Snippets

No Code Snippets are available at this moment for arraydeque.

Community Discussions

Trending Discussions on arraydeque

Java ArrayDeque - offerLast & pollFirst vs offerFirst & pollLast

Get NullPointerException when starting sbt 1.5.0

How to find powerset of an ArrayList of pairs: ArrayList> pairList

difference between the grow() methods in java.util.Stack and java.util.ArrayDeque

Copy a Map Object in Java

CameraX preview not working after upgrade

JMeter 5.4 When open testplan Unexpected error

Java producer consumer stop consumer threads

Does ArrayDeque have overhead of shifting elements on remove/add?

Why Java API doesn't provide us with bounded Queue implementations for non-concurrent environment?

QUESTION

Java ArrayDeque - offerLast & pollFirst vs offerFirst & pollLast

Asked 2021-May-17 at 05:17

I was doing some simple algorithm questions and playing around with ArrayDeque.

For example this one:

https://leetcode.com/problems/maximum-depth-of-binary-tree/submissions/

When using BFS, I noticed that offerLast & pollFirst / offerFirst & pollLast both give the same (correct) answer.

Is there a best practice for when to use which? Since this is supposed to be a queue, I think we should offerLast and use pollFirst. But why does offerFirst / pollLast also work?

...

ANSWER

Answered 2021-May-17 at 05:17

But why does offerFirst / pollLast also work?

Because the "start" and "end" of the queue are really just arbitrary decided.

You can call the first element the "start" and the last element the "end". In that case, offerLast enqueues, and pollFirst dequeues.

Since array deques are linear data structures, you can "flip it around" and say, I'll call the first element the "end" of the queue, and the last element the "start" of the queue. If you think like this, then you would enqueue by calling offerFirst and dequeue by pollLast.

Another way to explain this is to show that these are just two perspectives:

Let's say we are at standing at two ends of the deque. We both think that the element closest to us is the "first element" of the deque.

Source https://stackoverflow.com/questions/67563721

QUESTION

Get NullPointerException when starting sbt 1.5.0

Asked 2021-Apr-16 at 05:00

Getting the following error when running sbt command on any dir expect the homedir
Happens for sbt installed manually or via sdkman.
Happens for open jdk 11 and 16

...

ANSWER

Answered 2021-Apr-16 at 05:00

Cleaning caches did clear the issue.

Source https://stackoverflow.com/questions/67101800

QUESTION

How to find powerset of an ArrayList of pairs: ArrayList> pairList

Asked 2021-Feb-06 at 20:05

public static void generatePowerSet(ArrayList> pairList, int n_items) {
    Deque set = new ArrayDeque<>();
    
    if (n_items == 0) {
        System.out.println(set);
        return;
    }
    Object[] pair_array = pairList.toArray();
    // consider the n'th element
    set.addLast((Integer) pair_array[n_items - 1]);
    generatePowerSet(pairList, n_items - 1);

    // or don't consider the n'th element
    set.removeLast();
    generatePowerSet(pairList, n_items - 1);
   
    System.out.println(set);
}

...

ANSWER

Answered 2021-Feb-06 at 19:59

Here is a non recursive version for String elements. Convert to work with Pairs.

Source https://stackoverflow.com/questions/66080739

QUESTION

difference between the grow() methods in java.util.Stack and java.util.ArrayDeque

Asked 2021-Feb-02 at 11:49

I came across the grow() method for when a stack is full, but when I saw there was a difference in the grow() function in the arraydeque, I wondered what the difference actually was.

Does anyone know the answer to this?

...

ANSWER

Answered 2021-Feb-02 at 11:49

So eventually I found out that the differences are the following:

Stack growable:

Tight Strategy : Add a constant amount to the old stack (N+c)
Growth Strategy : Double the size of old stack (2N)

Arraydeque growable:

'Array deques have no capacity restrictions and they grow as necessary to support usage.' arraydeque

Source https://stackoverflow.com/questions/66000941

QUESTION

Copy a Map Object in Java

Asked 2020-Dec-31 at 21:32

I tried to follow the same way as in <How do I copy an object in Java?>.

But it does not work with Map object in the following codes. I want to copy the original map data to currMap. The current output is

0
1
2
3
null
null
null

I want it to be

0
1
2
3
0
2
3

What am I missing here?

...

ANSWER

Answered 2020-Dec-31 at 00:32

You can iterate over the Map directly and copy each value into a new Map.

Source https://stackoverflow.com/questions/65515153

QUESTION

CameraX preview not working after upgrade

Asked 2020-Dec-23 at 09:49

I've updated my gradle plugins for CameraX kotlin and all of a sudden I've got an error that I don't know how to fix.

This is my camera fragment

...

ANSWER

Answered 2020-Sep-21 at 13:36

Since Camera-View 1.0.0-alpha16, createSurfaceProvider() has been renamed to getSurfaceProvider()

Use:

Source https://stackoverflow.com/questions/63973767

QUESTION

JMeter 5.4 When open testplan Unexpected error

Asked 2020-Dec-10 at 08:01

I create a very simple testplan:

I save the testplan as MySimpleTestplan.jmx
Close JMeter
Start JMeter again as: double click on jmeter.bat
JMeter starts
I browse to MySimpleTestplan.jmx and selects it
Unexpected error. Se image below:
I look in log

WARN o.a.j.g.a.Load: Unexpected error. java.lang.NullPointerException java.lang.NullPointerException: null at java.util.ArrayDeque.addLast(ArrayDeque.java:304) ~[?:?] at java.util.ArrayDeque.add(ArrayDeque.java:495) ~[?:?] at org.apache.jmeter.gui.action.LoadRecentProject.updateRecentFileMenuItems(LoadRecentProject.java:125) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.util.JMeterMenuBar.setProjectFileLoaded(JMeterMenuBar.java:144) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.MainFrame.setProjectFileLoaded(MainFrame.java:330) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.GuiPackage.setTestPlanFile(GuiPackage.java:732) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.Load.loadProjectFile(Load.java:136) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.Load.loadProjectFile(Load.java:101) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.Load.doActionAfterCheck(Load.java:88) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.AbstractActionWithNoRunningTest.doAction(AbstractActionWithNoRunningTest.java:44) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:87) ~[ApacheJMeter_core.jar:5.4] at org.apache.jmeter.gui.action.ActionRouter.lambda$actionPerformed$0(ActionRouter.java:69) ~[ApacheJMeter_core.jar:5.4] at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313) [?:?] at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770) [?:?] at java.awt.EventQueue$4.run(EventQueue.java:721) [?:?] at java.awt.EventQueue$4.run(EventQueue.java:715) [?:?] at java.security.AccessController.doPrivileged(Native Method) ~[?:?] at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?] at java.awt.EventQueue.dispatchEvent(EventQueue.java:740) [?:?] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) [?:?] at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) [?:?] at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) [?:?] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) [?:?] at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:?] at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) [?:?] 2020-12-09 16:54:04,150 ERROR o.a.j.u.JMeterUtils: Unexpected error - see log for details

My Java version is: javac 11.0.8 JMeter version: 5.4 I'm really stuck here.

...

ANSWER

Answered 2020-Dec-10 at 08:01

Errors are known issues in 5.4 version and will be fixed soon on release 5.4.1, answered by @FelixSchumacher

you hit https://bz.apache.org/bugzilla/show_bug.cgi?id=64957 This regression will be fixed by a release (probably soon), but in the mean time you can try a current build from trunk or a nightly build (https://jmeter.apache.org/nightly.html)

If you don't want to downgrade, take new version from latest JMeter build

Source https://stackoverflow.com/questions/65220327

QUESTION

Java producer consumer stop consumer threads

Asked 2020-Nov-29 at 06:15

I have this piece of code and I want a good method to stop the consumer threads:

...

ANSWER

Answered 2020-Nov-28 at 17:59

One usual method is a "poison pill". Put a special value in the queue that when read kills the consumer threads. This allows them to process all of the values and not stop until they read past the final value and read the poison pill.

Some more info: https://java-design-patterns.com/patterns/poison-pill/

I also like these websites, they often have thoughtful information on Java programming:

https://mkyong.com/java/java-blockingqueue-examples/

https://www.baeldung.com/java-blocking-queue

Source https://stackoverflow.com/questions/65052819

QUESTION

Does ArrayDeque have overhead of shifting elements on remove/add?

Asked 2020-Nov-15 at 21:59

I came across this question, where 1st (accepted) answer says this part:

ArrayDeque doesn't have the overhead of node allocations that LinkedList does nor the overhead of shifting the array contents left on remove that ArrayList has.

I agree with node overhead, but not with the part about shifting elements. I know StackOverflow can also have wrong information, but this answer has many votes, so it must be my ignorance. So can someone tell me this:

Howcome ArrayDeque doesn't have overhead of shifting elements? ArrayDeque (as its name states) still uses an ARRAY. Meaning it works same as any other array. If I had 10 elements and I remove head, those 9 will have to be shifted 1 place to the left. And that is overhead that LinkedList doesn't have - it just changes reference to prev and next. Am I correct?

To sum, don't ArrayList and ArrayDeque work the same way? They both shift elements if structure gets changed. The only difference is that ArrayList can access any arbitrary location, while ArrayDeque works as FIFO/LIFO. Can someone please correct me if I am wrong? I don't want to learn something wrong here.

...

ANSWER

Answered 2020-Nov-15 at 21:59

It's great to have the intuition that removing from the front of an array will require everything to be shifted back. However, in the specific case of the ArrayDeque, the implementation is designed in a way that doesn't require this.

An array-based deque is typically implemented using a data structure called a circular buffer. The idea is that we maintain an array of elements, but pretend that the ends of the array are glued together to form a ring.

The ArrayDeque internally maintains an array of 16 elements, which we can view like this:

Source https://stackoverflow.com/questions/64847932

QUESTION

Why Java API doesn't provide us with bounded Queue implementations for non-concurrent environment?

Asked 2020-Nov-15 at 16:12

I am writing a small application and I want to have a bounded queue. The naive approach would be to do this:

...

ANSWER

Answered 2020-Nov-15 at 16:12

A single-threaded bounded queue implementation is not provided by the JDK likely because there is not a generic algorithm able to support all use cases. For example, what do you want to happen when the queue is full? Should incoming elements be discarded, should the last or first one?

Implementing your own according to your needs should be trivial.

Source https://stackoverflow.com/questions/64846412

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install arraydeque

You can download it from GitHub.
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.